I do recall reading some blog entry about the performance chart from one of the mods, but it was still in the testing phase, and the metrics are flawed.
In theory, an organic view would mean that the "click"/view of the specific ad was a result of a user browsing through your ads from your profile (ie...from the "See more items from seller X"). Currently, there is no abiltiy to search for a specific user/profile.
In regards to "buyer" view, usually it would equal to a user clicking on a specific item within the feed or from the search option.
All the above is useless, if the performance chart does not differentiate the overall views from a buyer that requires the item to be SHIPPED vs. LOCAL/PICKUP, since some sellers may not offer shipping, offer shipping only, etc.